whats wrong with zebra danio

[reddeerhobbiest]

two out of five of my zebra danios have started acting and looking funny. the bottom of their bellys is curvy(only way to describe it) the others have a nice round belly, the two in question also have red gills, and havent been as active as the others. they dont chase each other around anymore what could be wrong? they are the only two fish in my 55 gallon looking sick.

i hope these pics help.

 

[The-Wolf]

that picture is too small
red gills is often a sign of flukes.

can you post your water params and anything else the fish are doing /look like that is not normal, like clamped fins, gasping, not eating etc.